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Fair Value of Financial Instruments - Rollforward of Level 3 Assets Measured on Recurring Basis (Details) - Fair Value, Recurring Measurements [Member] - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]        
Level 3 assets, beginning of period $ 535 [1] $ 9,788 [1] $ 567 $ 8,162
Net unrealized gains (losses) included in other comprehensive income (4) [1] 236 [1] (13) 222
Realized gains (losses) and accretion (amortization) recognized in earnings, including OTTI 27 [1] 3 [1] 45 10
Purchases   1,250 [1]   1,250
Settlements (42) [1] (213) [1] (83) (441)
Transfers into Level 3   4 [1]   2,439
Transfers out of Level 3 [2]   (9,207) [1]   (9,781)
Level 3 assets, end of period [1] $ 516 $ 1,861 $ 516 $ 1,861
[1] Activities for investments that enter Level 3 in one quarter and exit Level 3 in another quarter within the same fiscal year are not eliminated until year-end when only the full year amounts are presented.
[2] During the three and six months ended June 30, 2017, transfers out of Level 3 assets primarily consisted of newly issued fixed-maturity securities in the previous quarter for which observable inputs, most notably quoted prices, used to derive valuations became readily available.